Sometimes we have to work on data preparation in the development process or update the stock multiple time for testing. Using an Impex can be faster for updating inventory and voiding any mistakes.
Here is the sample Impex to stock updates for particular Products and warehouse
INSERT_UPDATE StockLevel;productCode[unique=true];warehouse(code)[unique=true];available;
; 000584 ; warehouse1; 40
; 000012 ; warehouse1; 13
; 000030 ; warehouse1; 300
; 000041 ; warehouse1; 830 